The core2 will have a slower bus speed and at best ddr2 ram. All up slower. The clock speed of the processor isn't as "significant" as before. 2GB of RAM with expansion to 8GB is going to provide more room for growth than a 4GB RAM. But I'd be putting in 4GB anyway. If the 320GB HDD is a faster rpm than the other one it will most likely also have more cache and this with the faster spindle will improve speed too.
MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
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